Mens-schtjckebtwebke gesellschaft mit beschbankteb haftmtck



Aug. z8, 192s.

F. HANFF MEANS FOR PRODUCING VARNIVSHED WIRES Filed No'v. 25, 1925 y W/m, @N i.. .w

H mHJlIFHHII.

Patented Aug. 28, 1928.

UNITED STATES PATENT f FERDINAND HANFF, 0F BERLIN-CHARLOTTENBURG, GERMANY, ASSIGNQR TO SIZE-l MENS-SCHUCKEBTWEBKE GESELLSCEAJT MIT BESCHRNKTER HAETUNG., 0l" SIE- MENSSTADT, NEAR BERLIN', A..GORPORATION 0F. GERMANY;

MEANS FOR PRODUGING.' .VARNISHED WIRES.. I

My invention relates to a method of pro ducing varnished wires.

In the manufacture of varnished Wiresv the coating of varnish is applied successively iin.

a plurality of layers..V After the application of each layer the wire is passed through` a drying oven in which the varnish or the. like is baked. Hitherto this method has been carried out in such a manner that the wire, wasv passed in succession through the apparatus for ap lying the layers. of varnish and then throug the drying oven,'this process being repeated several times until the coating had attained the necessary thickness. The sameI wire is hereby repeatedly led back into the. oven or furnace over guide pulleys.

The principal drawback of this method resides in the fact that the inner layers of varnish become excessively brittle owinor to the repeated burning on or firing while the outer layers sometimes remain sticky. It has therefore been proposed to dry the wire in a number of heating channels or passage-ways kept at diiferent temperatures, for instance'in such a manner that the temperature of the heating channels or fluesfincreases from channel -tochannel. In reducing these proposals to practice the hitherto customary oven or furnace constructions were, however, not abandoned altogether. The heating channels through which the wire passes successively were arranged closely side by side. In this manner the production of a definite temperature difference between the individual channels was rendered diiicult.

These known methods fail altogether in the manufacture of varnished wire of-very small diameters because it is necessary to def of deflection is, furthermore, detrimental forv the material of the wires and the coating of varnish.' f'

My invention eliminates these drawbacks in the following manner; Theheating channels or passage-ways in which. the wire is dried are, at least generally, l'ocated in axial alinement in order to reduce the number of bends in they wire as fary as:l possible. The heating-channels traversed b'yfa wire are furthermore located in two or more. drying stoves or furnaces which are separated from one another, in order to facilitatetheadjustment of the various temperatures.

The apparatus for applying the varnish or the like may be supplied with varnishes of differentv composition, consistency or color, in order to obtain a'wire finished most suitably for the purpose for which-it is destined.

In the drawing aiiixed hereto Fig. 1 is a -sectional elevation of a plant suitable for carrying out my method.

Fig. 2 a plan of the same and Fig. 3 a sectional elevation of a slightly modified construction.

In Figs. 1 and.2 of the drawing a device or apparatus for carrying out the method is illustrated in which all successive heating ducts are located in one substantially straight line. In this embodiment the horizontal arrangement of the ducts has been chosen. The apparatus illustrated by Way of example serves for varnishing twelve wires simultaneously and drying or baking the same in individual heating ducts.

Referring to Fgsl and 2, a is a frame upon which are rotatabl located the reels b which hold the wire. T e wires c unwound from the reels pass over the guide rollers d into the varnish container or tank e1 in which a coating of varnish'is applied to them. They then travel through the individual-heating ducts f1 of the apparatus A and after issuing from those ducts they pass through the second varnish container e, and receive a second coating of varnish. From vhere they nass through the individual heating ducts f2 of the apparatus B and after issuing therefrom they receive a third coating of varnish in the varnish tank e3 and so on. After leaving the last group of heating ducts the wires are conducted over guide roller Z on to the winding reels m rotatably located upon the frame n.. The drive of the winding reels is not illustrated for the sake of simplicity being known to those skilled in the art. The heating ducts, of which only three, f1, f2, fa, are shown in series, are of different lengths and the length t of successive ducts increases in the direction of the travel.

The guide rollers d and Z may be omitted provided the reels 'b and m are placed at the The vapors caught are conducted along the outside of the ducts at z' and pass into the flue or conduit y' adapted to be throttled by a damper or valve c. The hot vapors transmit part of their heat to the heating ducts While passing along their outside and thus prevent radiation and therefore save heat. Their temperature remains, however, high enough to set up the necessary draft in the discharge conduit j. With this arrangement a special fan Jfor sucking oil' the vapors is rendered superfluous.

Another plant for practicing my improved method is illustrated in Fig, 3 of the drawing. In this plant the heating ducts f1 to f6 are all of equal length but their temperature rises in steps in thedirection ot' travel of the Wire. In the ducts f, there prevails the lowest temperature and in the ducts f, the highest. In order to shorten the length of the apparatus or plant two heatinvr ducts are located above each other or side by side in one frame. Each wire first traverses the ducts f1 to f3, is then reversed by the guide roller p and passes through the ducts or chambers f, to f6. Otherwise the design of the plant corresponds with that illustrated in Figs. 1 and 2.

Instead of locating the heating ducts horizontally, as illustrated, and thus to pass the varnished wires through the plant horizontally, a vertical or oblique arrangement of the ducts may be chosen.

Various modifications and changes may be made Without departing from the1 spirit and scope of the invention, and I desire, therefore, that only such limitations shall be placed thereon as are imposed by the prior art.

I cla-im as my invention 1. Machine for varnishing Wires having a plurality of varnishing devices and baking ducts arranged alternately and substantially in a straight line, the len h of the individual ducts increasing in the irection `of the wire travel.

2. Machine'for varnishing Wires,` having a plurality of separate baking ovens containing bakmgducts, and varnishing devices alternately arranged with said ducts in a straight line, the length of the individual ducts increasing in the direction of the wire travel, successive baking ducts being disposed in separate baking ovens.

3. Machine for varnishing wires, having a plurality of separate baking ovens containing baklng ducts, and varnishing devices alternately arranged with said ducts in a straight line, the length of the individual ducts increasing in the direction of the wire travel, successive baking ducts being disposed in separate baking ovens and means on said ovens for conducting the hot vapors issuing from said ducts around the outside thereof.

In testimony whereof I aix my signature.

FERDINAND HANFF. 

